Rocco Claudia, Suzuki Motofumi, Vilar Ramon, Garcia-España Enrique, Blasco Salvador, Larrouy-Maumus Gerald, Turnbull Colin, Wissuwa Matthias, Cao Xuan, Weiss Dominik
Centre for Bacterial Resistance Biology, Department of Life Sciences, Faculty of Natural Sciences, Imperial College London, London SW7 2AZ, United Kingdom.
Department of Earth Science and Engineering, Imperial College London, South Kensington Campus, London SW7 2AZ, United Kingdom.
J Agric Food Chem. 2025 Apr 9;73(14):8243-8253. doi: 10.1021/acs.jafc.5c02128. Epub 2025 Mar 27.
Bioavailable ligands that bind metals mediate their uptake in plants, leading to the study of artificial ligands as potential fertilizers. Proline-2'-deoxymugineic acid (PDMA) has shown a high affinity for Fe, enhancing iron uptake in rice and suggesting that it could be used for improving zinc uptake. This work studied chemical solution parameters, i.e., redox potential, ion strength, pH, and ligand/metal concentrations controlling Zn-PDMA complex formation in rice-producing soils using geochemical speciation modeling. We show that PDMA is generally selective for Zn in reducing, saline, and alkaline soil solutions. Comparison with a recent micronutrient uptake study in rice suggests that free PDMA should be added in reducing conditions to avoid competition with Cu and Fe or as the Zn-PDMA complex at pH below 9. The Zn/M ratios (M = Cu, Fe) needed to form stable Zn-PDMA complexes were also identified. This study shows the promise of PDMA as a fertilizer to overcome zinc deficiencies in alkaline and flooded soils.
与金属结合的生物可利用配体介导其在植物中的吸收,从而引发了对作为潜在肥料的人工配体的研究。脯氨酸-2'-脱氧 mugineic 酸(PDMA)对铁具有高亲和力,可增强水稻对铁的吸收,并表明它可用于改善锌的吸收。这项工作使用地球化学形态建模研究了控制水稻种植土壤中锌- PDMA 络合物形成的化学溶液参数,即氧化还原电位、离子强度、pH 值和配体/金属浓度。我们表明,在还原、盐碱和碱性土壤溶液中,PDMA 通常对锌具有选择性。与最近一项关于水稻微量营养素吸收的研究相比,表明应在还原条件下添加游离 PDMA 以避免与铜和铁竞争,或者在 pH 值低于 9 时作为锌- PDMA 络合物添加。还确定了形成稳定的锌- PDMA 络合物所需的锌/ M 比率(M = 铜、铁)。这项研究表明,PDMA 有望作为一种肥料来克服碱性和淹水土壤中的锌缺乏问题。